{"id":"CVE-2026-89986","revision":"72c4a5a23a744ff6a9b039659b80378d","records":[{"revision":"72c4a5a23a744ff6a9b039659b80378d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89986","aliases":[],"title":"mm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()\n\nsyzbot reported a sleeping function called from invalid context splat in\nbucket_table_alloc().\n\nWhen rhashtable_insert_slow() rehashes the table under rcu_read_lock(), it\ncalls bucket_table_alloc(..., GFP_ATOMIC | __GFP_NOWARN).  If the bucket\ntable allocation uses vmalloc, __vmalloc_node_range_noprof() invokes\nvm_area_alloc_pages() -> alloc_pages_bulk_mempolicy_noprof() with the\npassed GFP_ATOMIC flags.\n\nIf the current task has an MPOL_WEIGHTED_INTERLEAVE mempolicy,\nalloc_pages_bulk_weighted_interleave() is called and currently hardcodes\nGFP_KERNEL when allocating the temporary weights array, triggering a\nmight_alloc() splat in atomic/RCU contexts.\n\nPass the gfp flags (masked with GFP_RECLAIM_MASK to strip page-allocator\nzone modifiers like __GFP_HIGHMEM) received by\nalloc_pages_bulk_weighted_interleave() to kmalloc() instead of hardcoding\nGFP_KERNEL.  Since the weights buffer is immediately initialized in full,\nkmalloc() is sufficient.","state":0,"publishedAt":"2026-09-16T10:33:01.545+00:00","modifiedAt":"2026-10-19T08:56:00.678+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/mempolicy.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"fa3bea4e1f8202d787709b7e3654eb0a99aed758\",\n                            \"lessThan\": \"bcb3d0c867ee40dc48e9c085bf328fbc679b6656\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fa3bea4e1f8202d787709b7e3654eb0a99aed758\",\n                            \"lessThan\": \"0ceda28f371df9e0bbdaa29214f71fe8298f23d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fa3bea4e1f8202d787709b7e3654eb0a99aed758\",\n                            \"lessThan\": \"2943f1f4b7f2816177060eb9f551f2e6d8b629ba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"fa3bea4e1f8202d787709b7e3654eb0a99aed758\",\n                            \"lessThan\": \"540e583b66d6402bf556fde5e53c817a54c1afe5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/mempolicy.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/bcb3d0c867ee40dc48e9c085bf328fbc679b6656","https://git.kernel.org/stable/c/0ceda28f371df9e0bbdaa29214f71fe8298f23d8","https://git.kernel.org/stable/c/2943f1f4b7f2816177060eb9f551f2e6d8b629ba","https://git.kernel.org/stable/c/540e583b66d6402bf556fde5e53c817a54c1afe5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89986","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89986","identifiers":["CVE-2026-89986"]},"retained":false,"historicalAffected":[]}],"coverage":[]}